Stereotype-plate-casting machine



Dec. 1,1925- W. EVENSEN STEREOTYPE PLATE CASTING MACHINE Original Filed Feb. 1'7, 1921 T fr/ 4 Sheets-Sheet 1 INVENTOR (gz I Afro Ey Dec, 1 1925 W. EVENSEN STEREOTYPE PLATE CASTING MACHINE Original Filed Feb. 17, 1921 4 Sheets-Sheet 2 Dec. 1, 1925. A1,563,349

' l W. EVENS EN STEREOTYPB PLATE CASTING MACHINE original Filed Feb. 17, 1921 4 sheets-sheet s l I y l lNvE/vToR q] I ATTNEV Dec. 1, 1925. 1,563,349

W. EVENSEN STEREOTYPE P LATE CASTING MACHINE Original Filed Feb. '17, 1921 4 Sheets-Sheet 4 I ""mml \S l l lli Patented Dec. 1, 18225.

UNITED STATES istanti PATENT OFFICE.

WILLIAM EVENSEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOSS PRINTING PRESS COMPANY, A.' CORPORATION OF ILLINOIS.

STEREOTYPE-ILATE-CASTING MACHINE.

Original application filed February 17', 1921, Serial No. 445,781. Divided and this application filed November 15, 1921. Serial No. 515,306,

To all echo/1a t may Concern Be it known that I, Vv'nmlan llvnNsnN, a citizen oit the United States, residing at Chicago, in the county of Cook and State ot Illinois, have made certain new and use'ul Improvements in Stereotype-Plate-Casting Machines, of which the following is a specification. i

The invention relates to stereotype plate casting machines, and more especially to .improvements in the casting mechanism proper, that is, the elements constituting the casting chamber and the parts cooperating therewith.

Objects and advantages ot the invention will be set forth in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumcntalities and combinations pointed out inthe appended claims.

4The invention consists .in the novel parts, constructions, arrangements, combinations and in'iprovements herein shown and described.

'lhe acconipanying` drawings, referred to herein and constituting` a part hereof, illustrate one embodiment of the invent-ion, and together with the description, serve to explain the principles et the invention.

A'1 is an end elevation, with parts in 'vertical transverse section, otl a casting macliiie embodying the present invention;

Fig. 2 is a fragmentary, enlarged detail, in transverse section, ot the casting core, pump nozzle and thc drag, which are shown at the up )er centralpart ot Fig. 1, but showing them in casting position just after the plate has been cast g' Figi. il is an elevation ot the casting cylin- 'dcr or core, looking thereat trom the lclt in lf ig. f2 and trom the bottom in Fig. 4, the parts :it the right vo t the ligurev being shown in vertical emitral section; Fig. et is a detached detail, in top plan, ot 'the casting'cormthe matrix holding clips and associated parts, looking at 2 and from the top;l and l 1 lig. 5 isa pi-irspective oi' the end ring oi the casting chamber, showingespecially the gnideand shouliiler for the plate," when it is being rotated from casting to discharge position, Y

TlS @Plletsli is e division. ot my @o pending application Ser. No. 145,781, tiled February 17, 1921.

In casting hemi-cylindrical stereotype plates for rotary printing presses,`it is cus# tomary to have the cylinder or core of thel casting machine of slightly less diameter than the form or plate cylinder ot' the print ing press, so that the stereotype plate when put on the press will spring over the plate cylinder and hold tightly to the cylinder. Furthermore, in practical work, in making up the forms, composed usually or mostly oil? linotype slugs, the columns as made up are frequently over-lengthi By way of example, in a page having columns of twenty inches standard length, the pages as actual ly made up, and the matrix sheets made therefrom, will have the columns running to twenty and tive-eighths inches long, also, the standard twenty-one inch column pages will often run to about twenty-one and tl'n'ee-quartcr inches in length, as will also the twenty-two inch column pages.

The foregoing is a practical example of the application of the invention under the present practice of casting plates with the columns extending around the press cylinders. The invention is also applicable to produce extra long plates set in pages without columns. Also, if the columns run along the cylinder', the invention will produce columns of extra width, or an extra column on the plate, as the case may be. The invention provides a novel relation of the plate tothe casting mechanism, and the reference in the description and claims to a plate with extra length columns will be understood, as expressing the present most practical. ap-

plicati on of the invention.

By reason ottthe over length oi'ithe pages, and by reason of the relative smallness oi the casting core, and also with the/,risers at each end of a plate in a n'iachine where the metal is poured at a straight ledge oi the casting'chamber, it is 'frequently found that the plate will extend about thecasting core for an appreciable distance more than Va semi=circumference of 'the core. In such case, the plat-e is sprung in removing it from the 'casting core, and consequently will not lit tight-ly on the press cylinder. Y Also, they casting machines as ordinarily builtare either unable or not well adapted to castfl ing plates of such extra column. length,

According to the present invention, the core of the casting machine is composed of two heini-cylindrical parts, with their axes parallel but slightly separated from one another, the core, however, rotating about an axis in the common plane of, parallel to, and equally distant fromathe axes of the two heini-cylindrical parts of the casting core. The exterior of the core is a continuous surface, so that the core may present a Casting surface at the casting chamber' and a cast plate at delivery posit-ion by a half rotation of the core for each casting operation.

By way of example, with columns of the length already stated as being in common practical use, to provide for the extra length required, the axes of the heini-cylinders would be about five-eighths of an inch apart. `With a casting core so constructed and with theexemplary dimensions given., which as stated are those or4 some of those frequently found in newspaper press rooms, the stereotype plate will extend very little, probably about only one-half inch farther about the core than one-half of the circumference, which with the construction described permits the overlength plates to be cast and avoidsl injurious springing of the plates in removing them perpendicularly away from the core.

Referring now in detail to theV embodiment of the invention illustrated by way of example in the accompanying drawings, the invention is shown applied to a stereotype plate casting` machine having a horizontally disposed, rotatable core, with the concave casting member located beneath the core and reciprocablc upwardly to, and downwardly away from, casting position. The core makes a half rotation, to bring a cast plate to its top side preparatory to delivery thereof, and to present the other casting surface at the bottomside of the core, ready for casting, the hot metal being poured at one of the straight edges of the casting chamber. Such a machine may be of the general form shown in applications Ser. No. 407,984 and Ser. No. 407,985 of Joseph J. Walser filed Sept. 3, 1920, and is illustrated in Fig. 1 of the present drawings.

is the present invention relates to the casting mechanism, only an end view of the entire machine is `shown (Fig. l), illustrating the general form and arrangement of a casting mechanism of theV kind already described, although it will beunderstood that in many of its fea-tures, the invention is applicable to casting machines of other forms and constructions.

As so embodied, themachine comprisesa casting core 1 havi-ng a shaft or pin'tles 2 and 3 projecting from the ends thereof, and journaled, respect ly, at t and 5 in the machine frame. @Generating -with;` thecore l is a concave of drag member 10, these two constituting the main elements of the casting chamber. In the embodied form, the castingcore 1 makes a half rotation for each casting operation, the core carrying` the plate with it from casting to delivery position, and the concave 10 is located in the under side of the horizontally-disposed casting core and reciprocates vertically up to, and downwardly away from, the casting position.

Suitable matrix-stripping devices y are provided for stripping the matrix from the cast plate .fc as the member 10 recedes from the casting position, and these may be automatically spring operated, and may be of the general form shown and described in application Ser. No. 408,203 of Albert A. Henzi, filed Sept. 4, 1920. The matrix clamps are shown in the matrix stripping position in Fig. 1 and are shown in casting position in Fig. 2, and need not be described in detail.

Suitable mechanism is provided for imparting the periodic or succesive half rotations to the core 1, and this mechanism may be of the form shown in the Valser application referred to, and certain parts thereof are indicated by reference numeral 11 in Fig. 1 of the present drawing. This mechanism is driven from a general driving. and cam shaft 12. The drag or concave 10 may be reciprocated to and from casting position in any suitable manner, and as shown, is provided with guideways 13 and 14, running on guides formed in the machine frame 15. Mounted on the underside of the drag 10, and centrally thereof, are longitudinally spaced-apart cam rollers 16, which cooperate with cams 17. Cams 17 are mounted upon and rotate with the shaft 12 to impart the described movement to the concave casting member 10.

In Fig. 2y of the drawings is shown in detail the present preferred embodiment of the casting core or cylinder'. The casting core has two opposed castingfaces, each formed about its own axis, the two axes being spaced apart, whereby the core is. somewhat longcr on the diameter passing through the centers of the two casting faces than on the diameter which is perpendicular to said first-mentioned diameter. The core presents a continuous external surface, having two comparatively or substantially flat areas, one at each side, between the semi-cylindrical surfaces linst described. The core rotates aboutan axis located between and in the common plane of the respective axes of `the two semi-cylindrical casting parts already described. A

is embodied, and considering the core in the position shown in Fig. 2, the upper cylindrical portion of the core is cast or machined., or otherwise finished. about an lLSOv axis 25, the distances -26, 25-27 and 25-28 being radii of the heini-cylinder, the

semi-circumference thereof being represented by the line 272628. This represents one 'of the plate casting surfaces, or rather the lgreater partthereof, as the straight edges of the plate and the riser or risers may extend somewhat beyond this, to realize the advantagesof the machine in taking care of extradong plates when this is found to be necessary or desirable.

The other heini-cylindrical part of the core has its axis at 29, the distances 29-30, 29-31 and 2.9-32 being radii of the hemicylinder, the semi-circumference thereof being represented by the line 231-30432. This represents the other plate casting surface, or rather the greater part thereof, the plate extending past at either of its horixontal sides in the manner already explained in connection with the other casting surface.

The central section of the core may be regarded theoretically a rectangular solid block interposed between the two equal hemiscylinders to space them apart along one diameter thereof, while leaving` the diameter perpendicular to said first-mentioned diameter unchanged. This construction may be conveniently styled theorctically a cylindroid, although in a practical embodiment it may not be precisely of that form. ln Fig. 2 the lilies 27-31 and Qt- B2 may be straight or substantially straight, and the corresponding areas along the cylinder, may be flat or approximately, or substantially flat.

The core rotates about an axis disposed longitudinally thereof at the central point of its long diameter or dimension, represented by the line 26-30 in Fig. 2, whichy would be an axis through the point 33,

parallel to the axes runningl longitudinally o'l' the core through the points 25 and Q9 and lying midway between them, and in their cen'unon plane. llt will be understood that in actual practice there may not he strict conformity to the geometrical terms and constructioi'i, although such a description is deemed best adapted to explain the principle of the invention.

is stated, the cast plate ai is carried from the casting position to delivery position by the half rotation of the core l.. Toward the close of this movement of the core, as shown in Fig. l, the leading straight edge ofthe plate .r strikes a stop 39, and at the same time a traveling stop or pusher 40, mounted in guidevays ell and rcciprocated by means of a vpivoted connecting rod 42 through a cani and lever mechanism (not shown) from the shaft 1Q, enters beneath the rear or following straight edt-,eeV of the plate and then lifts the plate upwardly from the cylinder to the position shown in- Fig. 1. ready for delivery. Just prior to the half rotation of the casting core l, the concave l0 begins its downward movement, the matrix y being stripped from the plate as shown in Fig. 1. The concave 10 then moves back and just after the core l has come to rest it is back in casting position. lf it is desired to change the matrix sheet ,i/ this can be done when the concave l() is in recedent position.

Suitable end plates, or end rings as they are usually called, are provided to form or limit the sen'iicircular ends of `the casting chamber, and at the same time providing forthe removal of the cast plate from the casting position with a rotating core of the form described, and providing also for the delivery of the plate by lifting it slightly' from the core and then moving` it away in a direction longitudinal of the core.

As emhodieih at what` may be conveniently termed the outside end of the plate (Figs. 3 and l), an end plate 50 is provided of, or approximately of, semi-circular form, mounted independently of the rotating cylinder, and bearing against the lower half of the flat end of the core l. the outer periphery 5l of said end plate bearing against the drag or concave l() and the inner flat facey 52 of the end plate bearing against the 'llat side or end of the core cylinder l.' The ring thus constitutes a closure for this end of the casting chamber and always remains in operative position at the castingl chamber, as it docs not rotate with the core.

The end plate 50, in addition to closing that end'of the 'asting' chamber and holding down the curved end of the matrix sheet 1U, is also designed and intended to hold the plate a" in position on the core l during the rotation of the core, as the plate is -thereby carried'upwardly -to delivery `position. on the top side or just above the core. Due to the fact that the cast stereotype plate fu during the rotatlon of the core is not moving;l about its own axis 29, but

`is moving" about the axisof rotation 33 of the core, the central part of the plate follows a path lying outside of the circumference the liat side of the end plate into the casting chamber just over the end ofthe matrix y, and-formed and proportioned 'so as to form a shoulder in the curvedend of the plate zr as shown in Fig. 3. This lange 53 is or arcuate'end of the casting chamber, anddecreases v.in thickness outwardly towards vthe ends ofthe ring 50, as shownin Fig. 5.

wwwmain In other Words, the outer curved or peripheral face of flange 53 is concentric With the center 29 of the casting surface of the core and of the concave 10, while the inner curved or peripheral face 54 of the ring, along Which the corresponding shoulder 55 in the stereotype plate slides during the rotation of the core, is a semi-circumference, or approximately a semi-circumference concentric with the axis 33 (which it Will be recalled is the axis of rotation of the core) thereby providing a continuous, true bearing surface for the central; point of the shoulder 55 on the plate a until the plate is about half Way through its rotational movement With the core l.

In the embodied form of mounting, the ring 50 is mounted upon the machine frame and is spring-pressed against the flat end of the core l. As embodied, it is provided with a plurality of recesses, preferably three in number, into Which project pins 60, Which support the end plate in its general position, but permit sufficient movement thereof to insure tightclosing of the end of the casting chamber. Mounted upon the machine frame 6l is a semi-circular hub or flange 62, fitting closely around and back of the ring 50. The pins have enlarged screw-threaded outer portions which are screwed into threaded sockets in the machine frame 61, the pins 60 vprojecting therefrom through apertures or recesses in the frame and through corresponding recesses or apertures 64 in the hub or flange 62. Nested Within the apertures 64 and coiled about the pins 60 are springs 66, Which press against the outer flat side of the ring 50, and press it firmly against the 'fl-af; end of the core l.

The cooperating` mechanism at the opposite end of the casting chamber, as embodied, comprises an end ring, or preferably two segmental and approximately semicircular end plates, with -their ends somewhat separated, mounted opposite each other upon the same end of the core l. The tivo end plates are independently adjustable longitudinally of the core 1, to provide allowance or adjustment for matrix sheets and pages of different Width. As embodied, for the loiver half of the core as shown in Fig. .3 an end plate or ring is mounted upon the cylindrical exterior and at one end of the cylinder or core 1, having a-somewhat undercut or bevel annular front Wall 7l for giving vproper forni to thev adjacent end ofthe plate. The! ring or end plate 7 0 is made adjustable longitudinally of .the cylinder', and for' this purpose Ait is attached to the cylinder by screw bolts 75, passing through elongated slots oropenings 72 in the end plattev 70, the -h'e'ads of the scre'i'v bolts being counterfeiting A.in the plate 70. The longfufidinally-deposed slots 72 permit et adjustment of the end ring 70 longitudinally of the cylinder to accommodatematrix sheets of different Widths corresponding to different page Widths of the form. The outer cylindrical face or periphery 73 of the ring presses closely against the inner surface of the concave l() when the latter is at casting position, to close that end of thc casting chamber, and the ring` is slightly undercut at 7 et to clamp and protect the end of the matrix sheet y, in a Well known manner. The corresponding end ring or plate 70 upon the other half or casting surface of the core l may be similar in form and construction, and needA not be described in detail.

It will be noted from the foregoing that at its delivery end, that is, the end at Which or toward which the plate is delivered longitudinally of the cylinder into the trimming mechanism, the end plate or ring 50 is always at the casting position, and the cylinder or core l is free from any projection at that end. Thus but a very slight raising of the stereotype plate m away from the cylinder or core l is essential before starting the longitudinal movement of the plate m parallel to the cylinder and toward the trimming mechanism or other place of delivery as the case may be.

rllhe relation of the matrix holding and stripping clamps to the foregoing mechanism is clearly shown in Figs. 2 and 4, The inner jaiv 7 8 is provided with lugs 7S), rotatably mounted upon a shaft 80, which is carried upon brackets 8l, formed upon the frame of the drag or concave lO. A suitable helical spring 82 is coiled about the shaft 8O and impels the clamps into the matrix stripping position of Fig. l. The cooperating matrix clamping jaw 83 is slidablel on the top of the jaw 78 to grasp and to release the matrix y, and is held in matrix-clamping position by suitable means, such as clamping bolts 84, although in actual practice some more quickly-operating device is Ausually employed. The faces 85 of the clamp constitutes a closure for the straight edges of the casting chamber, and will also fit tightly over the straight ends of the end plates or rings 50 and 70. This action is possible with respect to the plates 7 O by reason of the spacing 'betuf'een t-he ends of the two plates circumferentially about the cylinder.

The embodied form of means for supplying the .hotstereotype metal to the casting chamber anddevices cooperating therewith, together with the novel devices for increasing their eiiciency, comp-rise a pump of suitable form and al furnace or other means for maintaining a. supply of hot metal. So far as concerns the present invention, the general features' thereof-may vbe of any suitable or convenient form. As herein shown they are of the general form illustrated and described in the VValserapplication Ser. No. 407,985, filed September 3, 1920, already referred to. The melting pot or furnace is indicated in the present drawings by and the pump by 91, the pump being automatically operated by means of a pivoted connecting rod 92, a lever 93, a rod 94 and a lever 95, from a cam 96.

Referring now in detail to the features of the present embodiment, which relate to this particular mechanism (Figs. 1 and 2), the top matrix clamp 83, on the pump side of the machine, is provided with a narrow, elongated slot 97, through which the hot metal is poured into the casting chamber. About the edge of slot 97 there is provided a beaded edge, or fitted bearing surface 98, which surrounds the slot and is adapted to cooperate with a bead, or fitted bearing surface on the pump nozzle (Fig. 2) of corresponding shape and size. The pump nozzle has its orii'ice or throat 106 of narrow, elongated shape to correspond to the slot 97'in the matrix clamp, the hot metal iiowng through from the interior 105 ofthe nozzle and through the .slot 97 into the casting chamber.

Formed on the underside of the nozzle 99 is a cooperating bead or fitted bearing sur face 100, which is, as stated, of the saine or corresponding form and dimensions as the bead 98 on the clamp, so that when the nozzle is at casting position, the beads 98 and 100 are in registry and close contact with each other as shown in Fig. 2. Formed also on the upper face of the clamp 83 is a bead of fitted bearing surface 101, and a bead or fitted bearing surface 102 cooperating there- .with is formed on the underside of the pump nozzle 99, these two beads registering and engaging together during the metal pumping action throughout the entire width of the nozzle to steady and hold the pump in position and to keep the matrix clamp in proper alinement.

Formed also upon the upper front face of the nozzle is a like bead, or fitted surface, 103, which is shaped to fit closely and truly against the side of the core, as shown in Fig. 2. This bead extends for the whole width of the nozzle orifice or throat and then downwardly along both sides of the orifice, as shown in Fig. 2, making a tight closure around the sides and top of the throat against the surface of the core 1. The lower lip of the orifice is cut away or recessed inwardly as shown at 104: to permit the vflowing' hot metal, which is forced through the interior 105 of the pump nozzle to flow down into the casting chamber.

One of the advantages of the casting core of the present invention is that it avoids or remedies theobjection or disadvantage ofv too great an overhang from the ends of the `arcuate ribs on the back of the sterotype plate to the adjacent straight edge of the plate. This overhang in the usual form of plate is especially long when the columns are somewhat overlength, as already eX- plained. The long overhang is objectionable and detrimental for the reason that the unsupported area between the ends of the ribs and the straight edge of the plate will spring when mounted on the press and impair the printing by that part of the plate.

The length of the ribs is governed by the location of the pump nozzle or mouth upon or against the side of the casting core. The nozzle should be clear of the rib-forming recesses of the top half of the core. The additional space provided in the central part of the surface of the core, when in the casting position permits the rib-forming recesses to be lengthened by a like amount or distance, and thus additional length of the ribs 110 ybrings their ends within effective supporting distance of the straight edges of the plate im, even when the plate is of suiiicient size to accommodate the extra` length columns.

In the operation of the machine, when vthe stereotype plate is lifted vertically from the core at delivery position, as already described and as shown in Fig. 1, with the end rings on the core of the form described and shown, the stereotype plate will move slightly endwise during the lifting movement so that its edge will come out from under the beveled edge of the end ring or plate 70, the rib-forming recesses 110 in the core having a greater angle than the beveled edge ill of the end ring 70, thus avoiding any tendency to a locking action during the lifting of the stereotype plate.

From all the foregoing it will be understood that a mechanism has been provided which realizes the objects and advantages set forth, together with other objects and advantages. It will also be understood that the invention in its broader aspects is not limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims without departing from the principles of the invention and without saerificing its chief advantages.

Vhat I claim is z- 1. A stereotype plate casting machine in* cluding in combination a rotatable core, one diameter of which is greater than the other, a cooperating concave casting member, and an end plate for the casting chamber mounts ed separately from the core and concave casting member.

2. A stereotype plate casting machine including in combination a rotatable core, one diameter of which'is greater than the other, a cooperating concave casting member, and an end plate for the casting soY chamber mounted to press with spring pressure to close the end of the casting chamber.

3. A stereotype plate casting machine including in combination a rotatable core, one diameter of which is greater than the other, a cooperating concave casting member, and an end plate for the casting chamber mounted to press with resilient pressure to close the end of the casting chamber, the end `plate having a curved flange thereon the inner and outer surfaces of which are curved about different centers.

-l. A stereotype plate casting machine including in combination a frame, a core, a cooperating concave casting member, an end plate for the casting chamber mounted upon the core, and a second end plate for the casting chamber mounted upon the frame.

5. A stereotype plate casting machine including in combination a frame, a core, a cooperating concave casting member, an end plate for the casting chamber mounted upon the core, a second end plate for the casting chamber mounted upon the frame, and spring pressure means pressing the second end plate against the core.

G. A stereotype plate casting machine including in combination a rotating core in the form of a cylindroid and having two casting surfaces, a concave cooperating member to form a casting chamber, and a semicircular end plate for the casting chamber, mounted separately from the core and concave member.

T. A stereotype plate casting machine including in combination a rotating core having two casting. surfaces, a concave cooperating member to form acasting chamber, an end plate for the casting chamber mounted on the core, and a semi-circular end plate for the other end of the casting chamber, springpressed, lmounted separately from the core and concave member.

8. A stereotype-platecasting machine includingin combination a machine frame, a rotating core in the form of a cylindroid and havingv two casting surfaces, a concave cooperating member to vform a casting chamber, and a semi-circular end plate for the casting chamber, mounted upon the machine frame.

9. A stereotype plate casting machine including in combination a machine frame, a rotating core having two casting surfaces, a concave cooperating memberto form a casting chamber, an end plate forthe casting chamber mounted `on the core, anda semicircular end plate for the other end of the casting chamber, spring mounted upon the machine frame.

10. A stereotype plate casting machine including in combination -a core, a cooperating concave member forming the casting chamber, an end plate for the casting chamber mounted on the core, and an end plate .for the other end of the casting chamber mounted independently of the core and the concave member.

11. A stereotype plate casting machine including in combination a machine frame, a core, a cooperating concave member forming the casting chamber, an end plate for the casting chamber mounted on the core, and an end plate for the other end of the casting chamber mounted on the machine frame, and spring means pressing said plate to close the end of the casting chamber.

12. A stereotype plate casting machine including in combination a rotating core having two casting surfaces, a concave member t cooperating successively with said surfaces `to form a casting chamber, means mounted on the core in position with respect to both casting surfaces to'close the end of the casting chamber, land a single end plate at the ing chamber', and a single end plate at the opposite end ofthe casting chamber, mounted independently of the core, and cooperating with both the casting surfaces.

14. A stereotype plate casting machine including in combination a machine frame, a

rotating core having two casting surfaces, a concave member cooperating successively with said surfaces to form a casting chamber, means mounted lonthe core in position with respect to both casting surfaces to close'the end of the Ycasting chamber, and a single end plate at the opposite end of the casting chamber, mounted on the Vmachine frame, and cooperating with both the casting surfaces.

l5. A stereotype plate casting machine including in combination a horizontally disposed, rotating corehaving two casting surfaces, a concavemember yon the bottom side of ythe core cooperating to form a casting chamber, end plates for the casting chamber fixed on the cylinder at one end thereof, and a semi-circular end plate at the bottom vside and opposite end of the cylinder, but mounted independently thereof, and closing that end of vthe casting chamber during each casting operation.

16. A stereotype plate casting machine including in combination a horizontally disposed rotatable core, a concave member beneath the core cooperating to form a casting chamber, a semi-circular plate mounted on one end of the core to close that end of the casting chamber, a semi-circular .plate at the opposite end of the core but mounted lll) independently thereof to close that end of the casting chamber and matriX clamps on the concave member to close the straight edges of the casting chamber and fitting on the ends of said semi-circular plates.

17. A stereotype plate casting machine including in combination a. rotatable core, a concave member cooperating to form a casting chamber, a semi-circular plate mounted on one end of the core to close that end of the casting chamber, a semi-circular plate at the opposite end of the core but mounted independently thereof to close that end ol the casting chamber and matrix clamps on the concave member to close the straight edges of the casting chamber and fitting on the ends of' said semi-circular plates.

1S. A stereotype plate casting machine including in combination a rotatable casting core having tivo casting surfaces, a concave member cooperating to form the casting chamber, two semi-circular end plates for the casting chamber fixed to the casting core at one end thereof, With their adjacent ends spaced apart, a non-rotating semi-circular plate closing the casting chamber at the opposite end and matrix clamps on the concave member for closing the straight edges of the casting chamber and fitting against the ends of the semi-circular end plates at cach end of the casting chamber.

19. A stereotype plate casting machine including in combination plate casting members constituting a casting chamber and including an end ring movably mounted to provide for casting plates varying in size.

20. A stereotype plate casting machine including i-n combination plate casting members constituting a substantially semicylindrical casting chamber and including an end ring movably mounted longitudinally of the axis of the casting chamber to provide for casting plates varying in size.

2l. A stereotype plate casting machine including in combination plate casting members including a cylindrically shaped core and a curved end ring longitudinally movable along the core to provide for casting plates varying in size.

22. A stereotype plate casting machine including in combination plate casting members constituting a casting chamber and including an end ring movable to provide for plates With an additional column.

23. A stereotype plate casting machine including in combination plate casting members constituting a substantially semi-cylindrical casting chamber and including an end ring movable to provide for plates with an additional column.

24. In a stereotype plate casting machine, the combinationy With a concave casting` member and core, of a fiat faced end ring for closing the casting chamber, the ring being provided with a flange of variable thickness extending laterally from said flat face.

25. In a stereotype plate casting machine, a flat faced end ring for the casting chamber, generally semi-circular in shape and provided ivith a flange varying in thickness extending laterally i'rom said flat face.

2G. ln a stereotype plate casting machine, a flat `faced end ring for the casting chamber, generally semi-circular in shape and provided with a semi-circular flange extending laterally from said Hat face, the flange being relatively thick at its middle part and thinner toward the ends.

27. In a stereotype plate casting machine, the combination With a rotatable core in the shape of a cylindroid, of an end ring mounted on the frame of the machine for closing the cast-ing chamber, the end ring having a substantially semi-circular flange extending laterally therefrom which is thickest at its middle portion and tapers toward either end.

In testimony whereof, I have signed my name. to this specific-ation.

ILLIAM EVENSEN. 

